US Scientists Invent World's First 'Anti-Laser'

Instead of having chips with transistors and silicon, these new computers will use both light and electrical energy

The laser - a 50-year-old invention now used in everything from CDs to laser pointers - has met its match in the "antilaser," the first device capable of trapping and canceling out laser beams.

While such a device would seem most fitting in a science fiction movie, its real-world application will likely be in next-generation, optical computers, which will be powered by light in addition to electrons, U.S. researchers said on Thursday.

"It's a device which basically works like running a laser backwards," A. Douglas Stone of Yale University, who published his findings in the journal Science, said in a telephone interview.

While a laser takes in electrical energy and emits light in a very narrow frequency range, Stone said, his antilaser takes in laser light and transforms it into heat energy.

But it could be easily converted into electrical energy, he said.

Conventional lasers, which were invented in 1960, use a so-called "gain medium," such as a semiconductor material, to produce a focused beam of light waves.

Stone's device uses silicon as an absorbent "loss-medium" that traps light waves, which bounce around until they are converted into heat.

And while the technology seems cool, his antilaser would never be used as a potential laser shield.

"This is something that absorbs lasers. If a ray gun was intended to kill you, it's going to kill you," Stone said.

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World's first hack-free software 'developed'

Scientists have developed what they claim is the world's first hack-free software which can protect systems from failure or malicious attacks. The 'seL4' microkernel has been developed by a team led by Australia's ICT Research Centre of Excellence's spinout company -- Open Kernel Labs (OK Labs). It is a small operating system kernel which regulates access to a computer's hardware.

Its unique feature is that it has been mathematically proven to operate correctly, enabling it to separate trusted from untrusted software, protecting critical services from a failure or a malicious attack, say the scientists.

In future applications, seL4 could ensure that trusted financial transaction software from secure sources like banks or stock exchanges can operate securely on a customer's mobile phone alongside "untrusted" software, such as games downloaded from the Internet, according to its developers.

It could also provide a secure and reliable environment for mission-critical defence data, operating on the same platform as everyday applications like email. Or, it could protect the life-supporting functions of an implanted medical device, such as a pacemaker, from hacking, they say.

"Our seL4 microkernel is the only operating system kernel in existence whose source code has been mathematically proven to implement its specification correctly. Under the assumptions of the proof, the seL4 kernel for ARM11 will always do precisely what its specification says it will do," lead scientist Gerwin Klein said.

Added another scientist Gernot Heiser: "Verification of operating-system kernels has been attempted since the 1970s -- we pulled it off!"

via hindustantimes